US5011726A - Low temperature sealing adhesive composition - Google Patents

Low temperature sealing adhesive composition Download PDF

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Publication number
US5011726A
US5011726A US07/482,522 US48252290A US5011726A US 5011726 A US5011726 A US 5011726A US 48252290 A US48252290 A US 48252290A US 5011726 A US5011726 A US 5011726A
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amount
weight
plasticizer
composition
adhesive composition
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US07/482,522
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Adem Chich
Steven S. Lalwani
Steven C. Bettoli
Louis L. Grube
Alfredo A. Bondoc
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Building Materials Corp of America
GAF Corp
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GAF Building Materials Corp
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Priority claimed from US07/292,408 external-priority patent/US4923913A/en
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Assigned to CITIBANK, N.A. reassignment CITIBANK, N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BMCA INSULATION PRODUCTS INC., BUILDING MATERIALS CORPORATION OF AMERICA, BUILDING MATERIALS INVESTMENT CORPORATION, BUILDING MATERIALS MANUFACTURING CORPORATION, DUCTWORK MANUFACTURING CORPORATION, GAF LEATHERBACK CORP., GAF MATERIALS CORPORATION (CANADA), GAF PREMIUM PRODUCTS INC., GAF REAL PROPERTIES, INC., GAFTECH CORPORATION, LL BUILDING PRODUCTS INC., PEQUANNOCK VALLEY CLAIM SERVICE COMPANY, INC., SOUTH PONCA REALTY CORP., WIND GAP REAL PROPERTY ACQUISITION CORP.
Assigned to GAF REAL PROPERTIES, INC., WIND GAP REAL PROPERTY ACQUISITION CORP., GAF LEATHERBACK CORP., LL BUILDING PRODUCTS, INC., BUILDING MATERIALS CORPORATION OF AMERICA, GAF MATERIALS CORPORATION (CANADA), BUILDING MATERIALS MANUFACTURING CORPORATION, DUCTWORK MANUFACTURING CORPORATION, BUILDING MATERIALS INVESTMENT CORPORATION, BMCA INSULATION PRODUCTS, INC., GAF PREMIUM PRODUCTS, INC., PEQUANNOCK VALLEY CLAIM SERVICE COMPANY, INC., SOUTH PONCA REALTY CORP., GAFTECH CORPORATION reassignment GAF REAL PROPERTIES, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITIBANK, N.A.
Assigned to DEUTSCHE BANK TRUST COMPANY AMERICAS reassignment DEUTSCHE BANK TRUST COMPANY AMERICAS SECURITY AGREEMENT Assignors: BMCA ACQUISITION INC., BMCA ACQUISITION SUB INC., BMCA FRESNO II LLC, BMCA FRESNO LLC, BMCA GAINESVILLE LLC, BMCA INSULATION PRODUCTS INC., BMCA QUAKERTOWN INC., BUILDING MATERIALS CORPORATION OF AMERICA, BUILDING MATERIALS INVESTMENT CORPORATION, BUILDING MATERIALS MANUFACTURING CORPORATION, DUCTWORK MANUFACTURING CORPORATION, GAF LEATHERBACK CORP., GAF MATERIALS CORPORATION (CANADA), GAF PREMIUM PRODUCTS INC., GAF REAL PROPERTIES, INC., GAFTECH CORPORATION, HBP ACQUISITION LLC, LL BUILDING PRODUCTS INC., PEQUANNOCK VALLEY CLAIM SERVICE COMPANY, INC., SOUTH PONCA REALTY CORP., WIND GAP REAL PROPERTY ACQUISITION CORP.
Assigned to DEUTSCHE BANK AG NEW YORK BRANCH reassignment DEUTSCHE BANK AG NEW YORK BRANCH SECURITY AGREEMENT Assignors: BMCA ACQUISITION INC., BMCA ACQUISITION SUB INC., BMCA FRESNO II LLC, BMCA FRESNO LLC, BMCA GAINESVILLE LLC, BMCA INSULATION PRODUCTS INC., BMCA QUAKERTOWN INC., BUILDING MATERIALS CORPORATION OF AMERICA, BUILDING MATERIALS INVESTMENT CORPORATION, BUILDING MATERIALS MANUFACTURING CORPORATION, DUCTWORK MANUFACTURING CORPORATION, GAF LEATHERBACK CORP., GAF MATERIALS CORPORATION (CANADA), GAF PREMIUM PRODUCTS INC., GAF REAL PROPERTIES, INC., GAFTECH CORPORATION, HBP ACQUISITION LLC, LL BUILDING PRODUCTS INC., PEQUANNOCK VALLEY CLAIM SERVICE COMPANY, INC., SOUTH PONCA REALTY CORP., WIND GAP REAL PROPERTY ACQUISITION CORP.
Assigned to GAF CORPORATION reassignment GAF CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GRUBE, LOUIS L., BONDOC, ALFREDO A.
Assigned to GAF CORPORATION reassignment GAF CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BETTOLI, STEVEN C., CHICH, ADEM, LALWANI, STEVEN S.
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2852—Adhesive compositions
    • Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
    • Y10T428/2883—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer of diene monomer [e.g., SBR, SIS, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31815—Of bituminous or tarry residue
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31931—Polyene monomer-containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon

Definitions

  • This invention relates to a novel blend of bituminous and synthetic rubber components which provides a superior low temperature sealing adhesive. More particularly, the invention relates to a self-sealing composition for roofing shingles and shingles having the composition thereon.
  • U.S. Pat. No. 3,978,014 describes blends having high aromaticity and at least 8% rubber content. While these blends exhibit good thermal stability, their self-sealing properties are relatively poor. Also, because of their high aromaticity, these blends are readily degraded by exposure to UV light during roof installation.
  • U.S. Pat. No. 4,559,267 also discloses roofing adhesive blends. However, these include substantial amounts of bitumen roofers flux in their composition which produces a tacky sealant leading to rider granule problems and packaging difficulties as exemplified by low squash resistance and premature adhesion of shingles when shipped in bundles and during installation.
  • U.S. Pat. No. 4,755,545 describes a self-sealing adhesive blend composed of a bituminous component of 100 percent of a road paving grade asphalt or a blend of such a road paving asphalt with a hard resin asphalt, 1 to 6% by weight of a thermoplastic styrene/butadiene block copolymer and 4 to 40% by weight of an inert filler.
  • This composition does provide some improvement with respect to squash resistance, reduced tackiness and improved low temperature stability.
  • the bituminous component must have an ACI of less than 0.26 and it is essential that the asphaltene content be less than 20%.
  • the road paving asphalt is a material having a penetration at 77° F. of between 40-80 dmm and a softening point of between 110° F. and 130° F.
  • composition of U.S. Pat. No. 4,755,545 presents additional problems with respect to processing such as, mixing difficulty in the dissolution of the elastomer thus requiring more elaborate equipment, e.g., homogenizers, high shear mixers, and the like.
  • an adhesive composition which is non-tacky, exhibits a high hardness and yet possesses excellent flow properties at low temperatures and thus permits strong bonding between roofing shingles and other roofing coverings.
  • the adhesive composition of the invention also exhibits excellent cold temperature strength.
  • an adhesive composition for use with roofing shingles comprising: a) a hard asphaltic bitumen fraction having a penetration number at 77° F. of from 0 to 30 dmm and a softening point of from about 150° to 220° F. (penetration number determined by ASTM D-5); and b) an elastomeric composition comprising a thermoplastic elastomer and a plasticizer selected from the group consisting of petroleum derived oils, such as, aromatics and naphthenics, or phthalate esters, phthalate ester derivatives, and mellitates, said plasticizer having a flashpoint equal to or greater than 250° F.
  • the hard asphaltic bituminous fraction of the present invention may be a propane cut bitumen, a petroleum bottoms asphalt modified by oxidation or mixtures thereof.
  • Thermoplastic elastomers suitable for use in the elastomeric composition component of the inventive adhesive composition include any rubber which is thermally processable, such as, styrene-butadiene-styrene, styrene-ethylene-butylene-styrene, and ethylene propylene.
  • the elastomeric composition also contains a plasticizer in an amount from about 1 to 80% by weight, and preferably, from about 10 to 70% by weight based on the weight of the elastomeric composition. Generally, when an oil is used rather than a phthalate or mellitate, the amount of plasticizer in the thermoplastic elastomer is higher.
  • Preferred plasticizers include, C 7-12 alkylphthalates or dialkylphthalates, and C 7-12 alkylmellitates including trialkylmellitates.
  • Illustrative of this group are trioctylmellitate, dioctylphthalate, and diundecylphthalate.
  • the elastomeric composition is present in an amount from about 1 to 20% by weight and preferably, from about 2 to 14% by weight based on the total weight of the adhesive composition.
  • the bituminous fraction is then generally present in an amount from about 99 to 80% by weight, and preferably, from 98 to 86% by weight based on the total weight of the bitumen and elastomeric composition.
  • fillers such as, for example, stone dust, limestone, ground glass fibers, and ground tires which can add strength to the composition, wollastonite, clay, sand, talc, mica, vermiculite, pearlite, carbon black and titanium oxide, which possess anti-oxidant and UV resistant properties as well as the ability to add strength to the blended material.
  • the amount of filler added would be in the range from about 5 to 50% based on the total weight of the adhesive composition, and preferably, from about 10 to 40% by weight.
  • the present composition may also contain a small amount of antioxidant, such as, a stearically hindered phenolic compound having a linear, branched or radial molecular structure.
  • antioxidant such as, a stearically hindered phenolic compound having a linear, branched or radial molecular structure.
  • these compounds are required to have a high decomposition temperature, e.g., greater than 400° F., to withstand mixing temperatures employed in the preparation of the blend.
  • Preferred antioxidants which may be incorporated are those having a decomposition and volatile loss temperature greater than 400° F.
  • Typical species include IRGANOX 1010 supplied by Ciba-Geigy, i.e., tetrakis [methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane which has a radial structure and an empirical formula of C 72 H 108 O 12 , the antioxidants covered in U.S. Pat. Nos. 3,285,855 and 3,644,482, AGERITE GT (an isocyanurate based hindered phenol supplied by R.T. Vanderbilt), and the like.
  • IRGANOX 1010 supplied by Ciba-Geigy, i.e., tetrakis [methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane which has a radial structure and an empirical formula of C 72 H 108 O 12 , the antioxidants covered in U.S. Pat. Nos. 3,285,855 and 3,644,48
  • the antioxidants When included in the formulation, e.g., in cases where a small amount of filler, e.g., less than 10%, is used, the antioxidants may comprise between about 0.05 and about 5% by weight, preferably not more than about 3% by weight of the total composition.
  • plasticizer to the adhesive composition in addition to that contained in the elastomeric composition.
  • the amount added would be from about 0.25 to 15% by weight based on the weight of the adhesive composition.
  • the adhesive composition including all additives, will have a softening point in the range from about 160° to 230° F., and preferably, from about 165° to 200° F.
  • the adhesive composition of the present invention may be prepared by heating the asphaltic bitumen fraction to a molten temperature and then adding the elastomeric composition containing the plasticizer thereto. Thereafter, any additional materials, e.g., fillers and the like, can be blended into the mixture.
  • plasticizer in addition to that contained in the elastomeric composition is utilized.
  • the additional plasticizer can be added to the molten asphaltic fraction prior to the addition of the elastomeric composition. This pre-addition of the plasticizer aids significantly in the mixing and complete blending of the subsequently added elastomeric composition.
  • conventional type mixing vessels and stirrers can be utilized as opposed to more specialized high shear blending equipment and homogenizers.
  • the inventive adhesive composition may be applied to a roofing element, such as, a shingle or continuous or rolled roofing sheet in the form of an adhesive strip or bead or in a pattern of beads or other configuration along an area which is to be contacted with a second roofing element, e.g., on the under surface or over surface of the roofing material where overlap or underlap of succeeding shingles or strips occur.
  • a roofing element such as, a shingle or continuous or rolled roofing sheet in the form of an adhesive strip or bead or in a pattern of beads or other configuration along an area which is to be contacted with a second roofing element, e.g., on the under surface or over surface of the roofing material where overlap or underlap of succeeding shingles or strips occur.
  • the same application can be effected to seal siding shingles or sheets.
  • the inventive adhesive composition may also be used as a hot melt for built-up roofs and the like.
  • the shingle material is passed over or under an applicator containing the present blend at a temperature of from about 250° F. to about 400° F.
  • the applicator can be a set of print wheels or an extruder capable of applying adhesive in beads of consistent size or as a continuous ribbon on a surface of the material to be joined and sealed to another member. After affixing the adhesive in the desired area or areas, the adhesive is quenched with water, air cooled or cooled by contact with any suitable quenching media.
  • the material on which adhesive is applied is cut to size after application, however, it is also within the scope of this invention to precut shingles or sheets which may be subsequently presented to the applicator for adhesive application.
  • the mixture was stirred utilizing a conventional propeller mixer; 4-8 % by weight of an oiled styrene-butadiene-styrene rubber was slowly added and stirring was continued.
  • the styrene-butadiene rubber added was either Finaprene produced by Fina Oil Company, or Kraton produced by Shell Chemical Co.
  • These rubbers contain from approximately 20 to 55% by weight naphthenic and/or aromatic oils with a balance being a block copolymer of styrene-butadiene-styrene having a tensile strength of 4,000-500 psi (ASTM D-412) an elongation of 800 to 900% (ASTM D-412), a Brookfield viscosity (toluene solution) at 77° F. of 4,000-20,000 cps and a styrene to rubber ratio of 25-35:75- 65.
  • a balance being a block copolymer of styrene-butadiene-styrene having a tensile strength of 4,000-500 psi (ASTM D-412) an elongation of 800 to 900% (ASTM D-412), a Brookfield viscosity (toluene solution) at 77° F. of 4,000-20,000 cps and a sty
  • the application temperature for the composition was from about 280° to 300° F.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

An adhesive composition for roofing such as shingles is disclosed which is composed of a hard asphaltic bitumen fraction having a penetration number at 77° F. of from 0 to 30 dmm and a softening point of from about 150° to 220° F. and an elastomeric composition composed of a thermoplastic elastomer and a plasticizer wherein the overall adhesive composition has a penetration number of from 30 to 100 dmm at 130° F. and a softening point of 140° to 230° F. The inventive composition is self-sealing and exhibits excellent squash resistance, low temperature properties and resistance to blowoff. The composition can be used with shingles as well as other types of roofing coverings.

Description

This is a divisional of application Ser. No. 292,408, filed Dec. 30, 1988, now U.S. Pat. No. 4,923,913.
BACKGROUND OF THE INVENTION
I. Field of the Invention
This invention relates to a novel blend of bituminous and synthetic rubber components which provides a superior low temperature sealing adhesive. More particularly, the invention relates to a self-sealing composition for roofing shingles and shingles having the composition thereon.
II. Description of the Prior Art
Many blends of bituminous material have been proposed which meet certain specifications but which are lacking in others, particularly specifications for roofing adhesives. Among the requirements for a self-sealing adhesive are resistance to crush when the shingles are packed in stacks for shipment, a relatively low melting temperature to permit self-sealing without the application of heating equipment and a strong bond between the joined surfaces which has high wind resistance and good low temperature stability. Other important considerations include good resistance to photo-oxidation; in particular, the ability to retain adhesive properties after exposure of the adhesive to sunlight for more than two hours. While certain of these characteristics are found in conventional blends, a combination of all of the above-mentioned properties has not been attained.
For example, U.S. Pat. No. 3,978,014 describes blends having high aromaticity and at least 8% rubber content. While these blends exhibit good thermal stability, their self-sealing properties are relatively poor. Also, because of their high aromaticity, these blends are readily degraded by exposure to UV light during roof installation. U.S. Pat. No. 4,559,267 also discloses roofing adhesive blends. However, these include substantial amounts of bitumen roofers flux in their composition which produces a tacky sealant leading to rider granule problems and packaging difficulties as exemplified by low squash resistance and premature adhesion of shingles when shipped in bundles and during installation.
Another problem with the prior art adhesive compositions is that they are essentially "contact adhesives". In other words, the primary strength of the bond formed by the adhesive composition is at the surface of the shingle. Thus, while the adhesives are relatively soft, they exhibit extremely slow flow properties at temperatures of 90° to 100° F. This means that the adhesive does not flow into the shingle and the bond remains essentially at the surface thereof. A stronger bond is formed between shingle layers when the adhesive composition flows partially into the contacting face of the shingle. Such an adhesive might be referred to as a "migrating" adhesive. Consequently, it is desired to have such a "migrating" property at low temperatures of 90° to 100° F. in order to provide stronger bonds and better wind resistance.
U.S. Pat. No. 4,755,545 describes a self-sealing adhesive blend composed of a bituminous component of 100 percent of a road paving grade asphalt or a blend of such a road paving asphalt with a hard resin asphalt, 1 to 6% by weight of a thermoplastic styrene/butadiene block copolymer and 4 to 40% by weight of an inert filler. This composition does provide some improvement with respect to squash resistance, reduced tackiness and improved low temperature stability. It is pointed out that the bituminous component must have an ACI of less than 0.26 and it is essential that the asphaltene content be less than 20%. The road paving asphalt is a material having a penetration at 77° F. of between 40-80 dmm and a softening point of between 110° F. and 130° F.
The composition of U.S. Pat. No. 4,755,545 presents additional problems with respect to processing such as, mixing difficulty in the dissolution of the elastomer thus requiring more elaborate equipment, e.g., homogenizers, high shear mixers, and the like.
SUMMARY OF THE INVENTION
We have discovered an adhesive composition which is non-tacky, exhibits a high hardness and yet possesses excellent flow properties at low temperatures and thus permits strong bonding between roofing shingles and other roofing coverings. The adhesive composition of the invention also exhibits excellent cold temperature strength.
More particularly, this is achieved in an adhesive composition for use with roofing shingles comprising: a) a hard asphaltic bitumen fraction having a penetration number at 77° F. of from 0 to 30 dmm and a softening point of from about 150° to 220° F. (penetration number determined by ASTM D-5); and b) an elastomeric composition comprising a thermoplastic elastomer and a plasticizer selected from the group consisting of petroleum derived oils, such as, aromatics and naphthenics, or phthalate esters, phthalate ester derivatives, and mellitates, said plasticizer having a flashpoint equal to or greater than 250° F. (COC) and a boiling point equal to or greater than 250° F., wherein the amount of plasticizer in the composition is such that the overall composition has a penetration number of from 30 to 100 dmm at 130° F. (in the absence of fillers) and a softening point of 140° to 230° F.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The hard asphaltic bituminous fraction of the present invention may be a propane cut bitumen, a petroleum bottoms asphalt modified by oxidation or mixtures thereof.
Thermoplastic elastomers suitable for use in the elastomeric composition component of the inventive adhesive composition include any rubber which is thermally processable, such as, styrene-butadiene-styrene, styrene-ethylene-butylene-styrene, and ethylene propylene. The elastomeric composition also contains a plasticizer in an amount from about 1 to 80% by weight, and preferably, from about 10 to 70% by weight based on the weight of the elastomeric composition. Generally, when an oil is used rather than a phthalate or mellitate, the amount of plasticizer in the thermoplastic elastomer is higher.
Preferred plasticizers include, C7-12 alkylphthalates or dialkylphthalates, and C7-12 alkylmellitates including trialkylmellitates. Illustrative of this group are trioctylmellitate, dioctylphthalate, and diundecylphthalate.
Generally, the elastomeric composition is present in an amount from about 1 to 20% by weight and preferably, from about 2 to 14% by weight based on the total weight of the adhesive composition. The bituminous fraction is then generally present in an amount from about 99 to 80% by weight, and preferably, from 98 to 86% by weight based on the total weight of the bitumen and elastomeric composition.
It is possible to add conventional fillers, such as, for example, stone dust, limestone, ground glass fibers, and ground tires which can add strength to the composition, wollastonite, clay, sand, talc, mica, vermiculite, pearlite, carbon black and titanium oxide, which possess anti-oxidant and UV resistant properties as well as the ability to add strength to the blended material. Normally, the amount of filler added would be in the range from about 5 to 50% based on the total weight of the adhesive composition, and preferably, from about 10 to 40% by weight.
Although not required, the present composition may also contain a small amount of antioxidant, such as, a stearically hindered phenolic compound having a linear, branched or radial molecular structure. When used, these compounds are required to have a high decomposition temperature, e.g., greater than 400° F., to withstand mixing temperatures employed in the preparation of the blend. Preferred antioxidants which may be incorporated are those having a decomposition and volatile loss temperature greater than 400° F. Typical species include IRGANOX 1010 supplied by Ciba-Geigy, i.e., tetrakis [methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane which has a radial structure and an empirical formula of C72 H108 O12, the antioxidants covered in U.S. Pat. Nos. 3,285,855 and 3,644,482, AGERITE GT (an isocyanurate based hindered phenol supplied by R.T. Vanderbilt), and the like. When included in the formulation, e.g., in cases where a small amount of filler, e.g., less than 10%, is used, the antioxidants may comprise between about 0.05 and about 5% by weight, preferably not more than about 3% by weight of the total composition.
It is also possible to add plasticizer to the adhesive composition in addition to that contained in the elastomeric composition. Typically, the amount added would be from about 0.25 to 15% by weight based on the weight of the adhesive composition.
Overall, the adhesive composition, including all additives, will have a softening point in the range from about 160° to 230° F., and preferably, from about 165° to 200° F.
The adhesive composition of the present invention may be prepared by heating the asphaltic bitumen fraction to a molten temperature and then adding the elastomeric composition containing the plasticizer thereto. Thereafter, any additional materials, e.g., fillers and the like, can be blended into the mixture.
An important advantage of the present invention can be obtained when plasticizer in addition to that contained in the elastomeric composition is utilized. In this case, the additional plasticizer can be added to the molten asphaltic fraction prior to the addition of the elastomeric composition. This pre-addition of the plasticizer aids significantly in the mixing and complete blending of the subsequently added elastomeric composition. As a result, conventional type mixing vessels and stirrers can be utilized as opposed to more specialized high shear blending equipment and homogenizers.
The inventive adhesive composition may be applied to a roofing element, such as, a shingle or continuous or rolled roofing sheet in the form of an adhesive strip or bead or in a pattern of beads or other configuration along an area which is to be contacted with a second roofing element, e.g., on the under surface or over surface of the roofing material where overlap or underlap of succeeding shingles or strips occur. The same application can be effected to seal siding shingles or sheets. The inventive adhesive composition may also be used as a hot melt for built-up roofs and the like.
For preparing coated shingles, the shingle material is passed over or under an applicator containing the present blend at a temperature of from about 250° F. to about 400° F.
The applicator can be a set of print wheels or an extruder capable of applying adhesive in beads of consistent size or as a continuous ribbon on a surface of the material to be joined and sealed to another member. After affixing the adhesive in the desired area or areas, the adhesive is quenched with water, air cooled or cooled by contact with any suitable quenching media.
Generally the material on which adhesive is applied is cut to size after application, however, it is also within the scope of this invention to precut shingles or sheets which may be subsequently presented to the applicator for adhesive application.
The following examples illustrate typical formulations of the adhesive composition of the present invention.
EXAMPLE 1
In a typical plant trial, approximately 1500 pounds of a hard asphalt resin (PEN @130° F.=20 to 60 dmm, per ASTM D-5, except that the total needle weight was 50 g and the temperature 130° F.) was pumped into a mix tank and heated to 300° to 380° F., preferably 350° to 380° F. When the resin penetration number at 130° F. fell below 40, 1-2 percent of a plasticizer (based on the weight of the hard asphalt resin) was added (in this case, the plasticizer was a dialkylphthalate).
The mixture was stirred utilizing a conventional propeller mixer; 4-8 % by weight of an oiled styrene-butadiene-styrene rubber was slowly added and stirring was continued. The styrene-butadiene rubber added was either Finaprene produced by Fina Oil Company, or Kraton produced by Shell Chemical Co. These rubbers contain from approximately 20 to 55% by weight naphthenic and/or aromatic oils with a balance being a block copolymer of styrene-butadiene-styrene having a tensile strength of 4,000-500 psi (ASTM D-412) an elongation of 800 to 900% (ASTM D-412), a Brookfield viscosity (toluene solution) at 77° F. of 4,000-20,000 cps and a styrene to rubber ratio of 25-35:75- 65.
The styrene-butadiene rubber dissolved in approximately 30 minutes. 30% by weight, based on the total weight of the blend of a limestone filler was then added and stirring was continued to thoroughly blend the filler into the mixture. Thereafter, the temperature of the mix was decreased to about 300° F. and the mix was pumped into an application tank for application to shingles. The application temperature for the composition was from about 280° to 300° F.
Shingles were then prepared utilizing the conventional application method as described above and outlined in U.S. Pat. No. 4,755,545 in connection with the drawing therein.
EXAMPLE 2
The following illustrates the optimum composition in accordance with the present invention.
______________________________________                                    
(1) Optimum                                                               
______________________________________                                    
Asphalt resin (propane extract or oxidized bitumen)                       
                              60%                                         
S.P. 194° F. PEN @ 130° F. = 23 dmm/ZECO AA-1021            
Filler (limestone)            30%                                         
Thermoplastic rubber (SBS) Shell Kraton 4460 (oiled)                      
                               8%                                         
Co-polymer compatible plasticizer (phthalate ester)                       
                               2%                                         
BASF 711P                                                                 
Final softening point (R & B): 190° F.                             
Penetration (before stabilizer) @ 130° F.: 59 dmm                  
______________________________________                                    
 *All softening points (S.P.) expressed herein are determined by the ring 
 and ball method, A.S.T.M. D36.

Claims (12)

What is claimed is:
1. In a roofing covering having an adhesive composition applied thereto, the improvement which comprises the adhesive composition comprising
(a) a hard asphaltic bitumen fraction having a penetration number at 77° F. of from 0 to 30 dmm and a softening point of from about 150° to 220° F.; and
(b) an elastomeric composition comprising a thermoplastic elastomer and a plasticizer, said plasticizer having a flashpoint equal to or greater than 250° F. and a boiling point equal to or greater than 250° F. and being present in an amount from about 1 to 80 percent by weight of the elastomeric composition;
wherein the amount of plasticizer in the adhesive composition is such that the mixture has a penetration number of from 30 to 100 dmm at 130° F. and a softening point of 140° to 230° F. and wherein the amount of bitumen fraction is from about 99 to 80 percent by weight and the amount of elastomeric composition is from about 1 to 20 percent by weight, based on the total amount of bitumen and elastomeric composition.
2. The roofing covering of claim 1 wherein the asphaltic fraction is propane cut bitumen, a petroleum bottoms asphalt modified by oxidation and mixtures thereof.
3. The roofing covering of claim 1 wherein the thermoplastic elastomer is selected from the group consisting of styrene-butadiene-styrene, styrene-ethylene-butylene-styrene, and ethylene propylene.
4. The roofing covering of claim 1 wherein the plasticizer is selected from the group consisting of petroleum derived oils, phthalate esters, phthalate esters derivatives, and mellitates.
5. The roofing covering of claim 1 wherein the amount of plasticizer is from about 10 to 70 percent by weight based on the weight of the elastomeric composition.
6. The roofing covering of claim 1 wherein amount of bitumen fraction is from about 98 to 86% by weight.
7. The roofing covering of claim 1 wherein additional plasticizer other than that contained in the elastomeric composition is present.
8. The roofing covering of claim 1 wherein the amount of additional plasticizer is from about 25 to 20% by weight based on the total weight of the adhesive composition.
9. The roofing covering of claim 1 which further comprises a filler.
10. The roofing covering of claim 9 wherein the amount of filler is from about 5 to 50% based on the total weight of the adhesive composition.
11. The roofing covering of claim 9 wherein the softening point of the adhesive composition is from about 160° to 230° F.
12. In a shingle having an adhesive composition applied thereto, the improvement which comprises the adhesive composition comprising
(a) a hard asphaltic bitumen fraction having a penetration number at 77° F. of from 0 to 30 dmm and a softening point of from about 150° to 220° F.; and
(b) an elastomeric composition comprising a thermoplastic elastomer and a plasticizer, said plasticizer having a flash point equal to or greater than 250° F. and a boiling point equal to or greater than 250° F. and being present in an amount from about 1 to 80 percent by weight of the elastomeric composition;
wherein the amount of plasticizer in the adhesive composition is such that the mixture has a penetration number of from 30 to 100° dmm at 130° F. and a softening point of 140° to 230° F. and wherein the amount of bitumen fraction is from about 99 to 80 percent by weight and the amount of elastomeric composition is from about 1 to 20 percent by weight, based on the total amount of bitumen and elastomeric composition.
US07/482,522 1988-12-30 1990-02-21 Low temperature sealing adhesive composition Expired - Lifetime US5011726A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5286544A (en) * 1990-08-28 1994-02-15 Minnesota Mining And Manufacturing Company Oil and rubber treated roofing granules
US5362566A (en) * 1993-03-04 1994-11-08 Minnesota Mining And Manufacturing Company Coating composition, granules coated with same, and method of reducing dust generation
US20040083674A1 (en) * 2002-11-06 2004-05-06 Kalkanoglu Husnu M. Laminated shingle with wider nailing zone
US20050170125A1 (en) * 2000-09-26 2005-08-04 Building Materials Investment Corporation Aluminum faced self adhering membrane
US20050223941A1 (en) * 2004-03-30 2005-10-13 Boyer David C Use of anti-strip agents to improve wear characteristics of pavement sealer
US20060003651A1 (en) * 2004-07-01 2006-01-05 Building Materials Investment Corporation Coating for granulated products to improve granule adhesion, staining, and tracking
US20070130863A1 (en) * 2005-12-01 2007-06-14 Jones David R Iv Roofing adhesive
WO2011019745A2 (en) 2009-08-10 2011-02-17 Kalkanoglu Husnu M Roofing products, photovoltaic roofing elements and systems using them
US11946254B2 (en) 2020-08-21 2024-04-02 Bmic Llc Roofing materials with improved low temperature sealant performance and methods of making thereof

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US4588637A (en) * 1983-04-05 1986-05-13 Rockcor, Inc. Adhesive composition
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US4588637A (en) * 1983-04-05 1986-05-13 Rockcor, Inc. Adhesive composition
US4824880A (en) * 1986-03-03 1989-04-25 Owens-Corning Fiberglas Corporation Asphalt adhesives

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5286544A (en) * 1990-08-28 1994-02-15 Minnesota Mining And Manufacturing Company Oil and rubber treated roofing granules
US5362566A (en) * 1993-03-04 1994-11-08 Minnesota Mining And Manufacturing Company Coating composition, granules coated with same, and method of reducing dust generation
US5484477A (en) * 1993-03-04 1996-01-16 Minnesota Mining And Manufacturing Company Coating composition, granules coated with same, and method of reducing dust generation
US20050170125A1 (en) * 2000-09-26 2005-08-04 Building Materials Investment Corporation Aluminum faced self adhering membrane
US20120227347A1 (en) * 2002-11-06 2012-09-13 Certainteed Corporation Laminated Shingle with Wider Nailing Zone
US8813453B2 (en) * 2002-11-06 2014-08-26 Certainteed Corporation Laminated shingle with wider nailing zone
US8984835B2 (en) 2002-11-06 2015-03-24 Certainteed Corporation Laminated shingle with wider nailing zone
US20040083674A1 (en) * 2002-11-06 2004-05-06 Kalkanoglu Husnu M. Laminated shingle with wider nailing zone
US8240100B2 (en) 2002-11-06 2012-08-14 Certainteed Corporation Laminated shingle with wider nailing zone
US7097703B2 (en) 2004-03-30 2006-08-29 Marathon Ashland Petroleum Co. Use of anti-strip agents to improve wear characteristics of pavement sealer
US20050223941A1 (en) * 2004-03-30 2005-10-13 Boyer David C Use of anti-strip agents to improve wear characteristics of pavement sealer
US20080038513A1 (en) * 2004-07-01 2008-02-14 Building Materials Investment Corporation Coating for granulated products to improve granule adhesion, staining, and tracking
US8394730B2 (en) 2004-07-01 2013-03-12 Building Materials Investment Corporation Coating for granulated products to improve granule adhesion, staining, and tracking
US20060003651A1 (en) * 2004-07-01 2006-01-05 Building Materials Investment Corporation Coating for granulated products to improve granule adhesion, staining, and tracking
US9067244B2 (en) 2004-07-01 2015-06-30 Building Materials Investment Corporation Method for coating granulated products to improve granule adhesion, staining, and tracking
US20070130863A1 (en) * 2005-12-01 2007-06-14 Jones David R Iv Roofing adhesive
WO2011019745A2 (en) 2009-08-10 2011-02-17 Kalkanoglu Husnu M Roofing products, photovoltaic roofing elements and systems using them
US11946254B2 (en) 2020-08-21 2024-04-02 Bmic Llc Roofing materials with improved low temperature sealant performance and methods of making thereof

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